Answer:
12.29 cm
Step-by-step explanation:
You want the length of the side marked x in the triangle shown.
Cosine
The sides of interest in the triangle are the hypotenuse and the side adjacent to the marked angle. This means the relevant trig function is ...
Cos = Adjacent/Hypotenuse
cos(35°) = x/(15 cm)
The value of x is given by multiplying this equation by (15 cm):
(15 cm)·cos(35°) = x
x = 12.29 cm
